EP 2140949 B1 20170531 - PROCESS FOR PRODUCING UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET
Title (en)
PROCESS FOR PRODUCING UNIDIRECTIONALLY GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEET
Title (de)
VERFAHREN ZUR HERSTELLUNG VON UNIDIREKTIONAL KORNORIENTIERTEM ELEKTROMAGNETISCHEM STAHLBLECH
Title (fr)
PROCÉDÉ DE PRODUCTION DE TÔLE D'ACIER ÉLECTROMAGNÉTIQUE À GRAINS ORIENTÉS DE MANIÈRE UNIDIRECTIONNELLE
Publication
Application
Priority
- JP 2008058229 W 20080422
- JP 2007114255 A 20070424
Abstract (en)
[origin: EP2140949A1] The invention produces a grain-oriented electrical steel sheet having a primary recrystallization structure in which Goss-oriented crystal grains and crystal grains having a coincidence orientation relationship to the Goss orientation are aligned in the rolling direction. It is characterized heating a slab containing, in mass%, C: 0.025 to 0.10%, Si: 2.5 to 4.5%, Mn: 0.03 to 0.55%, and Al: 0.007 to 0.040% to 1,100 to 1,450 °C or greater; hot rolling the slab to obtain a hot-rolled sheet; annealing the hot-rolled sheet; cold rolling the annealed sheet multiple times with a split-housing reversible cluster rolling mill; and subjecting the cold-rolled sheet to primary recrystallization annealing followed by secondary recrystallization annealing, in which method: (a) a first cold rolling or first and second cold rollings are performed using a small-diameter work roll of 55 mm to less than 105 mm diameter; (b) a second or third cold rolling to a penultimate cold rolling are performed using a large-diameter work roll of 105 mm to less than 150 mm diameter; and (c) a final cold rolling is conducted using a small work roll of a diameter smaller than the diameter of the large-diameter work roll.
IPC 8 full level
B21B 3/02 (2006.01); B21B 1/22 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/60 (2006.01); H01F 1/16 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP KR US)
B21B 1/22 (2013.01 - KR); B21B 1/36 (2013.01 - KR); B21B 13/147 (2013.01 - KR); C21D 8/12 (2013.01 - EP US); C21D 8/1222 (2013.01 - KR); C21D 8/1233 (2013.01 - EP KR US); C21D 8/1272 (2013.01 - KR); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); H01F 1/16 (2013.01 - EP KR US); H01F 41/024 (2013.01 - EP KR US); B21B 1/22 (2013.01 - EP US); B21B 1/36 (2013.01 - EP US); B21B 13/147 (2013.01 - EP US); B21B 27/021 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2140949 A1 20100106; EP 2140949 A4 20160713; EP 2140949 B1 20170531; BR PI0810570 A2 20111108; CN 101668596 A 20100310; CN 101668596 B 20120926; JP 5392076 B2 20140122; JP WO2008133337 A1 20100729; KR 101120125 B1 20120322; KR 20090114413 A 20091103; PL 2140949 T3 20171031; RU 2411092 C1 20110210; US 2010084058 A1 20100408; US 8236110 B2 20120807; WO 2008133337 A1 20081106
DOCDB simple family (application)
EP 08740914 A 20080422; BR PI0810570 A 20080422; CN 200880013394 A 20080422; JP 2008058229 W 20080422; JP 2009511922 A 20080422; KR 20097017729 A 20080422; PL 08740914 T 20080422; RU 2009143317 A 20080422; US 45099608 A 20080422